/*
 * Copyright (c) 2018-2020 "Graph Foundation,"
 * Graph Foundation, Inc. [https://graphfoundation.org]
 *
 * This file is part of ONgDB.
 *
 * ONgDB is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/*
 * Copyright (c) 2002-2020 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.cypher.internal.compiler.v3_4.planner.logical.steps

import org.neo4j.cypher.internal.compiler.v3_4.planner.logical.LogicalPlanningContext
import org.neo4j.cypher.internal.frontend.v3_4.notification.InternalNotification
import org.neo4j.cypher.internal.ir.v3_4.QueryGraph
import org.neo4j.cypher.internal.v3_4.expressions.{LabelName, Variable}

object DynamicPropertyNotifier {

  def process(variables: Set[Variable], notification: Set[String] => InternalNotification, qg: QueryGraph, context: LogicalPlanningContext) = {

    val indexedLabels = variables.flatMap { variable =>
      val labels = qg.selections.labelsOnNode(variable.name)
      labels.filter(withIndex(_, context))
    }

    if (indexedLabels.nonEmpty) {
      val indexedLabelNames = indexedLabels.map(_.name)
      context.notificationLogger.log(notification(indexedLabelNames))
    }
  }

  private def withIndex(labelName: LabelName, context: LogicalPlanningContext) =
    context.planContext.indexExistsForLabel(labelName.name)
}
